One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,6)(3,7,8,4)(9,10,12,14)(11,15,16,13)(17,18,22,27)(19,29,32,24)(20,33,35,42)(21,28,23,26)(25,37,40,34)(30,44,46,48)(31,39,36,41)(38,47,43,45)(2,6)(4,7)(9,11)(10,13)(12,16)(14,15)(17,19)(18,24)(20,30)(21,36)(22,32)(23,31)(25,38)(26,41)(27,29)(28,39)(33,48)(34,47)(35,46)(37,45)(40,43)(42,44) involution — undirected(1,3)(2,7)(4,6)(5,8)(11,16)(13,15)(17,20,23,34,22,35,21,37)(18,25,28,33,27,40,26,42)(19,30,31,47,32,46,36,45)(24,38,39,48,29,43,41,44)(2,6)(3,8)(10,14)(13,15)(17,21,22,23)(18,26,27,28)(19,31,32,36)(20,34,35,37)(24,39,29,41)(25,33,40,42)(30,45,46,47)(38,44,43,48)(1,4,5,7)(2,3,6,8)(19,32)(24,29)(30,46)(31,36)(38,43)(39,41)(44,48)(45,47)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.